My habit is when I change the oil I also change the oil and air filter. Always a surprise what I find in the air filter.
It's always interesting poking through an old air filter to see what types of bugs have been inhaled.
Larry
Motorcraft OEM air filters (MOTORCRAFT FA1632 Air Filter, 2000-2017 E450) are pretty inexpensive on Rock Auto: $11.56. (Amazon's price is about $15.00) I usually buy two air filters at a time from RA to save on shipping.
Spring provides an entomological banquet for the air filter (and the radiator, and the windshield, and the overcab...)! ;)